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Display calibration systems and related methods

  • US 9,276,766 B2
  • Filed: 08/05/2010
  • Issued: 03/01/2016
  • Est. Priority Date: 09/05/2008
  • Status: Active Grant
First Claim
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1. A display device, comprising:

  • an array of LEDs configured to produce light for the display device;

    a memory configured to store correction coefficients, which are associated with the array of LEDs and used to compensate for variations in the light produced by the array of LEDs;

    sense circuitry configured for measuring a photo-sensitivity of an LED within the array of LEDs by measuring an open circuit voltage and a short circuit current induced across the LED when the LED is illuminated with a light source; and

    control circuitry configured to adjust output power from the LED by;

    comparing the measured short circuit current with a short circuit current measurement previously determined while illuminating the LED with the light source to provide an indication of a variation in intensity of light produced by the LED over time;

    modifying one or more of the correction coefficients associated with the LED when a difference exists between the measured short circuit current and the previously determined short circuit current measurement; and

    when the one or more correction coefficients are modified, using the modified correction coefficients to adjust the output power from the LED by adjusting a current applied to the LED.

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